ad·u·lar·i·a ( j  -lâr  -, -lr-)n. A variety of transparent or translucent orthoclase. [Italian, from French adulaire, after Adula, a mountain group of southeast Switzerland.] |
adularia [ˌædjʊˈlɛərɪə]
n
(Earth Sciences / Minerals) a white or colourless glassy variety of orthoclase in the form of prismatic crystals. It occurs in metamorphic rocks and is a minor gemstone. Formula: KAlSi3O8
[via Italian from French adulaire, after Adula, a group of mountains in Switzerland]
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